Nice looking Kenmore electric range
Looks to be somewhere in the 80s, probably made by Westinghouse
The outlets disappeared because of the danger of chords, touching hot heating elements and causing shorts and shocks, it was a very easy standard to get manufacturers to agree to because it saved them money so they lobbied UL in the United States to get rid of outlets.
There were definitely times when an outlet on an electric range was a wonderful thing because a lot of older kitchens did not have enough outlets and heavy enough circuits for things like portable dishwashers and the outlet on the electric range was great because you had a full 15 or 20 amp circuit available for additional appliances, etc.
I even had a customer that had a window air conditioner in the kitchen plugged into the range.
John L